Alright, let's work through 77493791 times 78375626 step by step
77493791 × 78375626 = 78375626 × (77493791)
+ 78375626 × 1 which equals 78375626
+ 78375626 × 90 giving us 7053806340
+ 78375626 × 700 giving us 54862938200
+ 78375626 × 3000 that is equal 235126878000
+ 78375626 × 90000 that equals 7053806340000
+ 78375626 × 400000 which equals 31350250400000
+ 78375626 × 7000000 resulting in 548629382000000
+ 78375626 × 70000000 what gives us 5486293820000000

= 6073624380738166
